This update adds major performance improvements to structure, tree, and ore generation via my new Gaea BlockPopulator implementation, which prevents chunk cascading.

Note that this update also changes how biomes are defined to make them more evenly distributed. Unfortunately, you are unable to take advantage of this on an existing world without resetting, so a config option for legacy biome mode has been added.
This option will not automatically appear in configs, and it defaults to true (meaning, you don't have to do anything special to upgrade from 4.0.x to 4.1.x)

If you re-generate your configs on an existing world, remember to set this value!

Finally, this update also fixes a bug in loot table population that caused some items to be ignored in high-density loot tables. If you weren't finding Elytra in Gold Dungeons, this is why, and it has been fixed now!